Massive Galaxy Clusters Like El Gordo Hint at Primordial Quantum Diffusion
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Massive Galaxy Clusters Like El Gordo Hint at Primordial Quantum Diffusion. / Ezquiaga, Jose Maria; Garcia-Bellido, Juan; Vennin, Vincent.
I: Physical Review Letters, Bind 130, Nr. 12, 121003, 24.03.2023.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Massive Galaxy Clusters Like El Gordo Hint at Primordial Quantum Diffusion
AU - Ezquiaga, Jose Maria
AU - Garcia-Bellido, Juan
AU - Vennin, Vincent
PY - 2023/3/24
Y1 - 2023/3/24
N2 - It is generally assumed within the standard cosmological model that initial density perturbations are Gaussian at all scales. However, primordial quantum diffusion unavoidably generates non-Gaussian, exponential tails in the distribution of inflationary perturbations. These exponential tails have direct consequences for the formation of collapsed structures in the Universe, as has been studied in the context of primordial black holes. We show that these tails also affect the very-large-scale structures, making heavy clusters like "El Gordo," or large voids like the one associated with the cosmic microwave background cold spot, more probable. We compute the halo mass function and cluster abundance as a function of redshift in the presence of exponential tails. We find that quantum diffusion generically enlarges the number of heavy clusters and depletes subhalos, an effect that cannot be captured by the famed fNL corrections. These lateUniverse signatures could, thus, be fingerprints of quantum dynamics during inflation that should be incorporated in N-body simulations and checked against astrophysical data.
AB - It is generally assumed within the standard cosmological model that initial density perturbations are Gaussian at all scales. However, primordial quantum diffusion unavoidably generates non-Gaussian, exponential tails in the distribution of inflationary perturbations. These exponential tails have direct consequences for the formation of collapsed structures in the Universe, as has been studied in the context of primordial black holes. We show that these tails also affect the very-large-scale structures, making heavy clusters like "El Gordo," or large voids like the one associated with the cosmic microwave background cold spot, more probable. We compute the halo mass function and cluster abundance as a function of redshift in the presence of exponential tails. We find that quantum diffusion generically enlarges the number of heavy clusters and depletes subhalos, an effect that cannot be captured by the famed fNL corrections. These lateUniverse signatures could, thus, be fingerprints of quantum dynamics during inflation that should be incorporated in N-body simulations and checked against astrophysical data.
KW - CATALOG
KW - TELESCOPE
KW - COSMOLOGY
KW - DYNAMICS
KW - MODEL
U2 - 10.1103/PhysRevLett.130.121003
DO - 10.1103/PhysRevLett.130.121003
M3 - Journal article
C2 - 37027847
VL - 130
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 12
M1 - 121003
ER -
ID: 347469412